Noun
demethylation (plural demethylations)
(chemistry) The removal of one or more methyl groups from a molecule.
Although co-expression does not necessarily indicate co-regulation, methylation of bidirectional promoter regions has been shown to downregulate both genes, and demethylation to upregulate both genes. citation There are exceptions to this, however. Source: Internet
This demethylation reaction is often performed using pyridine and hydrochloric acid. citation Another source of illicit morphine comes from the extraction of morphine from extended-release morphine products, such as MS-Contin. Source: Internet